Block-graft copolymer

Abstract

Disclosed are a block-graft copolymer comprising a polymer block having a repeating unit represented by General Formula (I): ##STR1## wherein A is a side chain and represents an organopolisiloxane chain, a polyacrylate chain, a polymethacrylate chain, polydiene chain, etc. and a process for producing the same. This block-graft copolymer can have various performances such as oxygen enrichment performance, biocompatibility, depending on the kind of side chains.

We claim: 
     
       1. A block-graft copolymer comprising: a polymer block having a repeating unit represented by General Formula (I): ##STR13##  wherein R 1  represents a hydrogen atom, methyl group or ethyl group; R 2  and R 3  may be the same or different and each represent an alkyl group having 1 to 3 carbon atoms or phenyl group; m represents an integer of 0 to 4; and A represents any one of polymer residual groups represented by General Formulas (II) to (IV) shown below, ##STR14##  wherein R 4  may be the same or different and each represent methyl group, ethyl group or phenyl group; R 5  is as defined for R 4  or represents a group represented by the formula --Si(R 4 ) 3  ; and n is an integer of 1 to 1,000, ##STR15##  wherein R 6  represents a hydrogen atom or methyl group; and B represents a group represented by the formula --COOR 2 , where R 2  is as defined above, ##STR16##  --CH═CH 2  or --C(CH 3 )═CH 2  ; Y represents cumyl group, n-butyl group, s-butyl group or benzophenone residual group; and n is as defined above, ##STR17##  wherein Y represents cumyl group, n-butyl group or s-butyl group, and n is as defined above, and at least one of polymer blocks having a repeating unit represented by General Formula (V): ##STR18##  wherein R 7  represents a hydrogen atom, methyl group or ethyl group; M represents at least one selected from a group represented by the formula --CH═CH 2 , --C(CH 3 )═CH 2 , --COOCH 3  or --COOC 2  H 5  and phenyl group.   
     
     
       2. A block-graft copolymer as claimed in claim 1, wherein the polymer block having a repeating unit represented by General Formula I has a polymerization degree of at least 10. 
     
     
       3. A block-graft copolymer as claimed in claim 1, wherein the polymer block having a repeating unit represented by General Formula V has a polymerization degree of at least 300. 
     
     
       4. A block-graft copolymer as claimed in claim 2, wherein the polymer block having a repeating unit represented by General Formula V has a polymerization degree of at least 300.